Neurocranial anatomy of Paralligator (Neosuchia: Paralligatoridae) from the Upper Cretaceous of Mongolia DOI
Ivan T. Kuzmin, Ekaterina A. Sichinava, E. V. Mazur

et al.

Zoological Journal of the Linnean Society, Journal Year: 2024, Volume and Issue: 203(1)

Published: Dec. 13, 2024

Abstract Neurocranial features appear to be phylogenetically informative and key in assessing the still contentious relationships within Crocodylomorpha. However, braincases of many non-crocodylian taxa are incompletely studied precluding assessment evolutionary modifications at base Crocodylia. Here, we describe braincase osteology neuroanatomy paralligatorid crocodylomorph Paralligator from Upper Cretaceous Mongolia based on computed tomography (CT)-scanning, segmentation, 3D modelling several specimens. The anatomy brain endocast, nerves, paratympanic pneumatic cavities is consistent with its phylogenetic position close or Eusuchia. shares a suit neuroanatomical basal eusuchians crocodylians reflecting plesiomorphic condition for In addition, differences endocasts between larger-sized individuals Kansajsuchus smaller Shamosuchus ontogenetic changes extant crocodylians. This suggests that members more clade Paralligatoridae crown-group Crocodylia share similar during ontogeny. We also review distribution mesethmoid Crocodylomorpha show presence clades including Dyrosauridae.

Language: Английский

Endocranial anatomy and phylogenetic position of the crocodylian Eosuchus lerichei from the late Paleocene of northwestern Europe and potential adaptations for transoceanic dispersal in gavialoids DOI Creative Commons
Paul M. J. Burke, Sophie A. Boerman, Gwendal Perrichon

et al.

The Anatomical Record, Journal Year: 2024, Volume and Issue: 308(2), P. 636 - 670

Published: Sept. 3, 2024

Abstract Eosuchus lerichei is a gavialoid crocodylian from late Paleocene marine deposits of northwestern Europe, known skull and lower jaws, as well postcrania. Its sister taxon relationship with the approximately contemporaneous species minor east coast USA has been explained through transoceanic dispersal, indicating capability for salt excretion that absent in extant gavialoids. However, there currently no anatomical evidence to support adaptation extinct Furthermore, placement within Gavialoidea labile, some analyses supporting affinities Late Cretaceous early Paleogene “thoracosaurs.” Here we present novel data on internal external anatomy E. enables revised diagnosis, 6 autapormorphies identified genus 10 features enable differentiation . Our phylogenetic recover an diverging gavialid not part “thoracosaur” group. In addition thickened semi‐circular canal walls endosseous labyrinth paratympanic sinus reduction, identify potential osteological correlates glands surface prefrontal lacrimal bones These potentially provide dispersal , also them Portugalosuchus Given earliest stratigraphically oldest gavialoids either have nasal gland and/or recovered deposits, this suggests capacity might be ancestral Gavialoidea. Mapping geological onto phylogeny indicates was probably more than one independent loss/reduction

Language: Английский

Citations

5
Central African dwarf crocodiles found in syntopy are comparably divergent to South American dwarf caimans DOI
Václav Gvoždík, Matej Dolinay,

Ange‐Ghislain Zassi‐Boulou

et al.

Biology Letters, Journal Year: 2024, Volume and Issue: 20(5)

Published: May 1, 2024

Recent molecular taxonomic advancements have expanded our understanding of crocodylian diversity, revealing the existence previously overlooked species, including Congo dwarf crocodile (

Language: Английский

Citations

2
An anatomical reappraisal of the dwarf crocodylian Arambourgia gaudryi from the Eocene of Quercy (France) using CT data and its implications for the phylogeny and paleoecology of basally branching alligatoroidsCitation for this article: Conedera, D., Pochat-Cottilloux, Y., Rinder, N., Adrien, J., & Martin, J. E. (2024) An anatomical reappraisal of the dwarf crocodylian Arambourgia gaudryi from the Eocene of Quercy (France) using CT data and its implications for the phylogeny … DOI

Davide Conedera,

Yohan Pochat‐Cottilloux,

Nicolas Rinder

et al.

Journal of Vertebrate Paleontology, Journal Year: 2023, Volume and Issue: 43(4)

Published: July 4, 2023

After about a century, the skull of holotype and sole specimen Arambourgia gaudryi from Eocene Quercy (France) is here redescribed. Its interest resides in its extreme morphology, such as very small altirostral condition, that raises questions maturity, taxonomic validity, paleoecology. In order to reveal previously hidden anatomical details, we used computed microtomography (µCT-scan) data digitally extract bones cranium mandible, well endocranial structures. Here, update osteological description A. gaudryi, outlining new characters re-evaluating details. Comparing it with ontogenetic series extant crocodylians, confirm mature individual dwarf species pedomorphic features. Our phylogenetic analyses indicate an alligatorine. Comparisons other alligatoroid taxa show indeed valid species. The depositional environment finding site suggests continental context karstic network. Taking this into account, together peculiar anatomy, propose was semi-terrestrial animal occupying ecological niche similar juvenile or crocodylians. Finally, discuss current knowledge paleobiogeography Alligatoroidea Europe during Paleogene. likely part group early globidontans arrived Old World, probably North America, around end Paleocene dispersed at least four localities ancient European archipelago.

Language: Английский

Citations

4
The anatomy and taxonomy of the North African Early Miocene crocodylian ‘ Tomistoma ’ dowsoni and the phylogenetic relationships of gavialoids DOI Creative Commons
Paul M. J. Burke, Cecily S. C. Nicholl,

Bethany E. Pittard

et al.

Journal of Systematic Palaeontology, Journal Year: 2024, Volume and Issue: 22(1)

Published: Oct. 3, 2024

Language: Английский

Citations

1
3D models related to the publication: Neuroanatomy and pneumaticity of the extinct Malagasy ‘horned’ crocodile Voay robustus and its implications for crocodylid phylogeny and palaeoecology. DOI Open Access
Gwendal Perrichon, Yohan Pochat‐Cottilloux,

Davide Conedera

et al.

MorphoMuseuM, Journal Year: 2023, Volume and Issue: 9(4), P. e205 - e205

Published: Dec. 22, 2023

The present 3D Dataset contains the models analyzed in

Language: Английский

Citations

1
Size, not phylogeny, explains the morphology of the endosseous labyrinth in the crown clade Crocodylia DOI Creative Commons
Yohan Pochat‐Cottilloux, Gwendal Perrichon, Lionel Hautier

et al.

Journal of Anatomy, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 20, 2024

Abstract The endosseous labyrinths are associated with several functions, including hearing and spatial orientation. Throughout their evolutionary history, crocodylomorphs have thrived in diverse environments, the morphology of has been suggested as a proxy for inferring lifestyle. However, relationships between shape ontogenetic phylogenetic factors difficult to interpret rarely investigated depth previously, particularly terms dataset size. Here, we present most complete date on extant crocodylians, 111 specimens covering 22 species different status (from hatchlings adults). Using 3D geometric morphometrics, show that allometry constitutes major contributor variation crocodylian development this structure is likely linked braincase conformation, all genera. We also find moderate signal, but only without considering size effect, so it could not be translated into relevant discrete morphological characters. Based these results, discuss remaining problems prevent inclusion fossil forms highly divergent lifestyles study how ecological differences shaped crocodylomorphs.

Language: Английский

Citations

0
Neurocranial anatomy of Paralligator (Neosuchia: Paralligatoridae) from the Upper Cretaceous of Mongolia DOI
Ivan T. Kuzmin, Ekaterina A. Sichinava, E. V. Mazur

et al.

Zoological Journal of the Linnean Society, Journal Year: 2024, Volume and Issue: 203(1)

Published: Dec. 13, 2024

Abstract Neurocranial features appear to be phylogenetically informative and key in assessing the still contentious relationships within Crocodylomorpha. However, braincases of many non-crocodylian taxa are incompletely studied precluding assessment evolutionary modifications at base Crocodylia. Here, we describe braincase osteology neuroanatomy paralligatorid crocodylomorph Paralligator from Upper Cretaceous Mongolia based on computed tomography (CT)-scanning, segmentation, 3D modelling several specimens. The anatomy brain endocast, nerves, paratympanic pneumatic cavities is consistent with its phylogenetic position close or Eusuchia. shares a suit neuroanatomical basal eusuchians crocodylians reflecting plesiomorphic condition for In addition, differences endocasts between larger-sized individuals Kansajsuchus smaller Shamosuchus ontogenetic changes extant crocodylians. This suggests that members more clade Paralligatoridae crown-group Crocodylia share similar during ontogeny. We also review distribution mesethmoid Crocodylomorpha show presence clades including Dyrosauridae.

Language: Английский

Citations

0